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Beginner

DHCP Snooping- PCs are not taking IP address after enabling DHCP snooping

Hi,

    I have enabled DHCP snooping in our network. but after enabling the same, User machines are not getting IP address from DHCP server. I have attached the network diagram with all details. kindly assist me to sort out this issue.

6 REPLIES 6
VIP Advisor

HelloAre you trusting also

Hello

Are you trusting also the interfaces towards your dhcp server?
Is DHCP option 82 enabled?

check by:
sh ip dhcp snooping

If this is enabled then try trusting dhcp relay on those interfaces

int x/x
ip dhcp relay information trusted


 

 

res

Paul



kind regards
Paul

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Beginner

Hi Paul,       Option 82 is

Hi Paul,

       Option 82 is enabled. I have configured "ip dhcp snooping trust" on all the trunk interfaces. please note that dhcp snooping is not enabled in the server farm switches where DHCP server is connected.

Regards,

Ramith

Collaborator

Hi, What IOS version is

Hi,

 

What IOS version is running on the access switch? Some version of 15.0  have broken dhcp snooping.

 

Thanks

John

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Beginner

Hi John,    IOS Version 12.2

Hi John,

    IOS Version 12.2(55)SE8 is running in my 3560 access switches.

 

Regards,

Ramith

Beginner

Hi all,    I have tried "ip

Hi all,

    I have tried "ip dhcp relay information trusted" and "no ip dhcp snooping information option" and still the PCs are not getting IP address from DHCP server. but as soon as I remove dhcp snooping command from the switch, it started working. please help.

FYI : All the PCs are connected through AVAYA phones and the access interfaces are configured with Access vlan and Voice vlan.

We have a Microsoft DHCP

We have a Microsoft DHCP server and we are not using option 82.

no ip dhcp snooping information option

 

Regards Harrie

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